Carbothermal reduction of sillimanite

Structure-property relationships of mullite-SiC-Al2O3–ZrO2 composites developed during carbothermal reduction of aluminosilicate minerals

“…Recently, using of carbon black with the M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 3 activated charcoal have been used as a reducer agent to develop mullite-alumina-SiC composite from sillimanite. The results have been shown that mullite matrix composite has been formed from activated charcoal, and α-alumina is obtained in the presence of carbon black [12]. Under nitrogen atmosphere, β ᇱ − sialon‫ݏ‬ is also formed instead of β-SiC in most cases according to the following equation [12] (eq.…”

“…The results have been shown that mullite matrix composite has been formed from activated charcoal, and α-alumina is obtained in the presence of carbon black [12]. Under nitrogen atmosphere, β ᇱ − sialon‫ݏ‬ is also formed instead of β-SiC in most cases according to the following equation [12] (eq. (1):…”

“…It has been reported that various parameters such as: the type of starting materials sillimanite [11][12], andalusite [13], kaolinite [14][15][16][17], zircon [18][19][20] and molar ratio of C/SiO 2 [21], volume fraction of SiC [1][2], temperature and atmosphere of sintering [11] can be associated to the variation in microstructures, phase composition and mechanical properties of composite materials.…”

“…Alumina and mullite based composites have been promised as advanced materials for high-temperature applications because of their low susceptibility to oxidation, low thermal expansion coefficient, good thermal shock resistance, high creep resistance in conjunction with good thermal and chemical stability [7][8][9][10]. However, these composites are brittle and suffer from poor fracture resistance with low mechanical properties [10][11][12][13]. The low mechanical properties of these composites can be improved with introducing different reinforcing phases such as: SiC; ZrO 2 ; TiC; TiB 2 ; etc.…”

“…in the matrix [1][2][3][4][5][7][8][9]. Aluminum and zirconium silicate minerals (kaolinite, andalusite, sillimanite, zircon ) as starting materials in reaction with carbon as a carbothermal reduction agent have been abundant and inexpensive for fabrication of mullitealumina based composites reinforced with in-situ formation of SiC and ZrO 2 components [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28].…”